The primary objective of this study is to assess the change in patient reported positional pain intensity (PI) as measured by an 11-point numerical rating scale (NRS-11) in cancer patients with bone metastases assessed at a simulation visit and each subsequent daily palliative radiation fraction. The primary objective will be measured using the pain intensity difference (PID) of the NRS-11 from the time of laying down on the hard surface (0 minutes/ PI0) to the 15 minutes after laying down on the hard surface timepoint at baseline (the simulation visit) and at each subsequent study visit (PID15= PI0- PI15).